Abstract
To investigate the relationship between the size and structure of TiO<sub>2</sub> nanoparticles, three size-selected samples of TiO<sub>2</sub> nanoparticles were prepared via a hydrolysis method that uses Ti[OCH(CH<sub>3</sub>)<sub>2</sub>]<sub>4</sub> as the starting material. The structures of the nanoparticles were characterized using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS). Analysis of the XRD patterns and of the TEM images showed that the samples were dispersed, with an average particle size of ~30 nm (sample A), ~12 nm (sample B), and ~7 nm (sample C). Their X-ray absorption spectra indicate that samples A and B have an anatase structure, whereas sample C has a structure very similar to that of the TiO<sub> 2</sub> II phase, which generally arises only under high-pressure conditions. This difference can be attributed to size-induced radial pressure within the smaller nanoparticles, which plays an important role in the phase of TiO<sub>2</sub> nanoparticles in sample C.
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